Online research in philosophy

In the present article, the role of Gestalt concepts in clarifying the issues of perception is evaluated. Grounded in anti-atomism, Gestalt assumed organizing forces intrinsic to perception. Insofar these were identified with singularity preference, Gestalt is criticized for having failed to distinguish between perception and thought.

This paper is devoted to stress the importance of the contribution of Gaetano Kanizsato contemporary psychology. His theoretical ideas have in many respects been truly seminal. In particular, are emphasized his distinction between the primary and secondary process, his criticism of the concept ofPrägnanz, and his focus on self-organisation in a dynamic approach. To continue his work, the main task is to identify the rules and constraints that enable us to see the world as it appears. In the last (...) years of his scientific work, his insight was that the non-linear dynamic approach may be the best way to achieve this goal, giving a more sound sense to the intuitions of Gestalt psychologie.Unfortunately, he died before he could reap the fruits of this insight. Here are reviewed the first results that some among his direct and indirect pupils have obtained in this direction. (shrink)

The essay underlines the complementarity between theory and experimentation as a characteristic feature of the Meinong-school. In particular, it deals with the nucleus of a theory of presentation implicit in the theory of production. In fact, on the basis of Benussi's experimental results, I distinguish between presentation and representation, relatively to the various phases of the moment-now as the qualitative primitive of cognition. This result has various consequences which shed light on the act-side: it shows that the production relation relates (...) to the act and not to the produced object, clarifying some difficulties concerning the nature of ideal objects in Meinong's ontology; that the psychological act grantes the objects of knowing on the basis of cognitive determinants which are assimilative determinants and determinants of connection. These cognitive aspects of the act are indeed forms of completions of the known objects. Endly, the essay deals with the a-modal development of Benussi's theory of the cognitive aspects of the act as performed by the Italian Gestaltist Gaetano Kanizsa. (shrink)

The essay analyses the mereological structure of an act of intentional presentation, on the basis of Benussi' and Kanizsa's works. Several aspects are discussed, among which: The existence of diverse formats of representation, their eventual continuity, the presence of subjective integrations at primary levels, and the identification of phrases in the phenomenic structure of an act of presentation. It is argued that the difference between perceptual and mental presence, as elaborated by Kanizsa, proves to be a valid instrument (...) for the categorial analysis of phenomenic appearances. (shrink)

We present a neuro-geometrical model for generating the shape of Kanizsa's modal subjective contours which is based on the functional architecture of the primary areas of the visual cortex. We focus on V1 and its pinwheel structure and model it as a discrete approximation of a continuous fibration π: R × P → P with base space the space of the retina R and fiber the projective line P of the orientations of the plane. The horizontal cortico-cortical connections of (...) V1 implement what the geometers call the contact structure of the fibration π, and defines therefore an integrability condition which can be shown to correspond to Field's, Hayes', and Hess' psychophysical concept of association field. We present then a variational model of curved modal illusory contours (in the spirit of previous models due to Ullman, Horn, and Mumford) based on the idea that virtual contours are “geodetic” integral curves of the contact structure. (shrink)

What is the relation between Kanizsa's bias towards convexity and the Gestaltists' demonstrations that perceptual organization obeys a principle of pragnänz, or simplicity? Why should either kind of bias exist? Textbook accounts assign no functional role for these biases. Geon theory (Biederman 1987) proposes that we can understand these biases in terms of fundamental processes by which complex objects are decomposed into convex (or singly concave) regions at points of matched cusps according to the transversality regularity (Hoffman and Richards (...) 1985). Such decomposition yields simple, convex parts segmented between the concavities. A shape that contains concavities is generally regarded as complex insofar as it can be decomposed into the regions, or parts, between the concavities. It is these simple parts that are the stable elements of shape, not the whole object. In fact, geon theory leads to the expectation that shape recognition proceeds most efficiently when the parts are good (in the pragnänz sense) but the object is bad! (shrink)

This paper provides a synthesis and translation of Le strutture speculative della dottrina della scienza; Il pensiero di J.G. Fichte neglianni 1801–1807 (Genova: Pantograf, 1995) by Gaetano Rametta. The 1807 Wissenschaftslehre offers important insight into Fichte’s mittlere Phase (1801–1807). Fichte’s text and Rametta’s work on it remain untranslated into English; this translation, the notes to which offer a running commentary and defi nitions of key terms, intends to make the former known through the latter. Rametta focuses on Fichte’s analysis (...) of vision, and the vision of vision. In his middle-period and later work, Fichte developed thistheme far past the early Jena-period doctrine thereof, as treated by Dieter Henrich. Within this thematic context, Rametta also discusses the proof-structure of the1807 WL, the distinction between Wahrheitslehre and Phänomenologie, and the concept of Weisheit or “wisdom.” The article concludes with a treatment of thesignificance of Fichte’s later philosophy for the philosophy of religion. (shrink)

In this paper I try to establish a relation between some fundamental concepts of Gadamerian philosophy—namely, the concepts of play, of transmutation into form, and of increase in being—and the concept of truth. The concept of play allows one to conceive the extra-methodical character of truth as an objectivity radically different from that of science: the objectivity of what happens and is thus unrepeatable, absolutely independent of any methodical mastery; the concept of transmutation into form is a theorization of the (...) effectual character of truth; the concept of increase in being shows its nonredundant character, i.e., the idea that truth is more than reality. Truth is eventually conceived as a “transformational concept,” in which ontology, knowledge, and ethics are indissolubly interconnected. (shrink)

Dei numerosi libri che hanno iscritto Nelson Goodman tra i giganti della filosofia del Novecento, questo può a buon diritto considerarsi il più fortunato ma anche il più difficile, il più discusso, il più scomodo. Pochi giorni dopo la sua comparsa in libreria, nell’autunno del 19781, la New York Review of Books ne pubblicò una recensione a firma di W. V. O. Quine che non esitava a definirlo «una congerie».2 Si parla di stile, di teoria della citazione, di illusioni ottiche, (...) di filosofia della natura e filosofia dell’arte. Si citano Peirce, Gombrich e Kanizsa a fianco di Kant, Dummett, Woody Allen. Si coniano neologismi («acquacentrico») quando pure esistono parole che fanno al caso («idrocentrico»). Insomma, c’è un po’ di tutto, e «la fragilità del tutto riflette la filosofia che lo tiene insieme: la dottrina secondo cui ci sono svariati mondi, nessuno dei quali onnicomprensivo»3. A Goodman la recensione non piacque e la risposta non si fece attendere. In una lettera all’Editore pubblicata due settimane dopo4, il filosofo ringraziava per la pronta recensione ma accusava il Professor Quine di aver taciuto ai lettori che il libro era da leggersi sullo sfondo delle opere che l’avevano preceduto: La struttura dell’apparenza, Fatti, finzione e previsione, I linguaggi dell’arte e Problemi e progetti.5 E assicurava che.. (shrink)

In this paper, we present an account of phenomenal con- sciousness. Phenomenal consciousness is experience, and the _problem _of phenomenal consciousness is to explain how physical processes.

Plato’s Theaetetus sets the problem of the definition of science; moreover, what there is in question is the problem of the definition in general. Defining means measuring, referring to definite parameters what is initially indefinite. But it is not a case that the dialogue opens with the discussion about the commensurable and incommensurable numbers: the search for what is common to all sciences is the search for their common measure, for the term to which various elements are or can be (...) commensurated. The apories Plato is showing in refuting the Protagorean thesis appear clearly as an objection against the absolute commensurability of all things: each sense is a parameter of a determinate sensible object and then results as quite incommensurable with another sense; a present sensation is incommensurable with a non present one, either past or future; all these facts question the possibility of the definition, for they reduce the knowledge, and the reality, to a set of atomic and quite unrelated elements. In the same way, the other definitions of science are rejected because of their incompleteness. But the negative conclusion of the Theaetetus regarding the definition of science must be assumed in a positive way: every operation of defining constantly presents an excess which belongs to the incommensurability and leaves every definition in a state of incompleteness. Through a comparison with the problem of the commensurable and incommensurable numbers, what is eventually shown is that the Being itself, as a mean between subject and predicate in the proposition, constitutes the diagonal element of every process of definition, irreducible to the elements that come into play. Being is, literally said, the incommensurable. (shrink)

Theory of language is an important factor in the plans of political and educational reform drawn by Italian philosophers of the eighteenth century. Analysis of language is a technique they often resort to when discussing the foundations of political philosophy and the ways and means of social communication. Interesting suggestions concerning philosophy of language can be found in the works of writers on political economy and philosophy of jurisprudence (Antonio Genovesi, Gaetano Filangieri, Cesare Beccaria, Melchiorre Gioia, Gian Domenico Romagnosi, (...) among others), where subjects such as abuse of words and linguistic arbitrarism are connected to theoretical and practical problems of the transition from feudal to bourgeois régime. (shrink)

In this paper we discuss a view of the Machine Learning technique called Explanation-Based Learning (EBL) or Explanation-Based Generalization (EBG) as a process for the interpretation of vague concepts in logic-based models of law.The open-textured nature of legal terms is a well-known open problem in the building of knowledge-based legal systems. EBG is a technique which creates generalizations of given examples on the basis of background domain knowledge. We relate these two topics by considering EBG''s domain knowledge as corresponding to (...) statute law rules, and EBG''s training example as corresponding to a precedent case. (shrink)

Inverting a face impairs perception of its features and recognition of its identity. Whether faces are special in this regard is a current topic of research and debate. Kanizsa studied the role of facial features and environmental context in perceiving the emotion and identity of upright and inverted faces. He found that observers are biased to interpret faces in a retinal coordinate frame, and that this bias is readily overruled by increased realism of facial features, but not easily overruled (...) by environmental context. An additional factor contributing to a retinal coordinate-frame interpretation may be the ambiguous nature of the face stimuli. Since his facial expressions are interpretable both upright and inverted, they may in both orientations activate an endogenous attentional process for faces. We present visual search and change-blindness experiments that explore how inversion, negation, and facial emotion affect visual attention to static faces. We find that attention to faces is impaired by inversion and negation. We also find that the parts of the face that receive greater attention can be influenced by the emotional expression of the face. We propose to extend these experiments to dynamic faces. To this end, we develop a theory of the visual representation of dynamic faces, in which faces are represented by classes of `spacetime fragments'-moving regions of the face with high informational content. We then present ideas for future experiments which are motivated by the spacetime fragment theory, and which should serve to constrain its further development. (shrink)

Collinearity or correspondence between the contours of the inducing figure to allow `contour continuation' or `figure completion' were, according to G. Kanizsa, the necessary conditions for producing anomalous surfaces or contours. Since Kanizsa's early work various hypotheses have been advanced to explain the phenomenon, but very few examples of anomalous contours that do not satisfy the above conditions have been reported. When two small white discs (1 cm in diameter) are set on a larger black disc in slow (...) rotation, the two discs, after some observation time, will appear as the extremities of a rigid cylinder displaced in depth. The surface of the cylinder, under dim illumination, appears as a whitish transparent surface. However, when the two discs are substituted by a circle and a semicircle of the same size, a clear anomalous contour appears to form the cylinder, even under clear light conditions and when the colours are reversed; i.e., black circles on white disc. The anomalous contours are not apparent when the configuration is stationary. I will demonstrate how the anomalous contours of a stereokinetic cylinder can be obtained even without the “interruption” of the lines in the semicircle. (shrink)

“Radical understanding” – an expression recalling Quine’s “radical translation” and Davidson’s “radical interpretation” – concerns that necessary presupposition of every understanding that is shown in extreme cases of indecipherability. Such a minimum content consists in understanding an existence. Indeed, Heideggerian ontological hermeneutics has weaved together understanding and existence to the point that it is possible to establish an analogy between the existential analysis and the several grades of text decipherability: the passage from the inauthentic to the authentic existence can be (...) read as a passage from the semantic (radical interpretation) to the syntactic (radical translation) and to the ontological level (radical understanding). The level of radical understanding is the one in which the minimal content of understanding coincides with its formal condition of possibility, in which understanding is to understand an existence. (shrink)

Introspectively we experience a phenomenally rich world. In stark contrast, many studies show that we can only report on the few items that we happen to attend to. So what happens to the unattended objects? Are these consciously processed as our first person perspective would have us believe, or are they – in fact – entirely unconscious? Here, we attempt to resolve this question by investigating the perceptual characteristics of visual sensory memory. Sensory memory is a fleeting, high-capacity form of (...) memory that precedes attentional selection and working memory. We found that memory capacity benefits from figural information induced by the Kanizsa illusion. Importantly, this benefit was larger for sensory memory than for working memory and depended critically on the illusion, not on the stimulus configuration. This shows that pre-attentive sensory memory contains representations that have a genuinely perceptual nature, suggesting that non-attended representations are phenomenally experienced rather than unconscious. (shrink)